The Mathematical Cartoons of Larry Gonick

Larry is also the author of my son's favorite history book: The Cartoon History of the Universe[1]

1- http://en.wikipedia.org/wiki/The_Cartoon_History_of_the_Univ...

He also did The Cartoon Guide to Physics and probably a few others in the series: http://www.amazon.com/Cartoon-Guide-Physics-Larry-Gonick/dp/... These are very popular in some homeschooling circles.